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  1. K


    Hello CAFCNA!!!! I'm back again with another code to chase down. P1400-00 This one popped up a couple days of no issues, no CEL. Chasing other codes several days prior, I replaced the Throttle Position Sensor, Mass Air Flow Sensor, and Air Filter. The throttle body seemed to be in pretty good...
  2. K


    2009 5.3L.....With no noticeable performance issues, my check engine would sometimes come on and stay on upon start up, sometimes it wouldn't. It never came on while driving. Using my recently purchased MUCAR CDE900 PRO I got the following 3 codes: P0121-00(Throttle Position Sensor)...